Largest cam in 351W without cutting the pistons (Looking at AFR185s)

[82 GT]

I have one of the answers you are looking for:
That '87 351w cam has the following specs:

.206 intake, .221 exhaust @ .050
.440 intake valve lift, .450 exhaust valve lift
115 degrees lobe separation

I don't know about the piston cutting question though but a good cam that I've been hearing about lately(and from Comp Cams) is the Extreme Energy 274 cam:

274*/286* (230/236@.050) .519/.523 lift 110* LSA

I'm returning my 292 magnum cam and getting this one for my motor ( I know...I know....this is the 2nd cam I've returned but this is the final cam...LOL)

I'm getting my stock heads ported & polished and having 2.02/1.60 valves installed as we speak. I'm almost certain that I'm going to need my pistons cut for those size valves.
I'm thinking that you might too because the eyebrows are probably only cut for stock size valves.
Let me know what you find out.